The log shows:
java.sql.SQLIntegrityConstraintViolationException: [SDL WorldServer][SQLServer JDBC Driver][SQLServer]Violation of PRIMARY KEY constraint 'sessionsPk'. Cannot insert duplicate key in object 'dbo.sessions'. The duplicate key value is (2110750846).
WS 10 seems to working fine, but we get this error a few times a day, possibly due to our Astoria Contents, but we haven't been able to isolate the cause.